You could do AOT Java using gcj, it didn't need commercial tools.

If we ignore gcj was never production ready, and basically the only good case that Red-Hat sponsored was to compile Eclipse, which was usually slower than using the JIT anyway.

And that around 2009, most of the team left the project, some went to OpenJDK, others elsewhere, while GCC kept it around because gcj unit tests stressed parts of the GCC that weren't tested by other frontends, until the decision came to remove it completly.

As side note, I expect a similar outcome to gccgo, abandoned since Go added generics support.